The main goal of science is to a. learn how to use the laws of nature to benefit humans. b. learn about the universe and the laws of nature. c. replace old theories with new, more interesting theories. d. develop new inventions and processes.

The main goal of science is to learn about the universe and the laws of nature. (B)

The goal of Applied Science, Technology, and Engineering is to develop new inventions and processes (D), that can use the laws of nature to benefit humans. (A)

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach